AQA A Level Biology复习笔记6.2.9 Drug Effects on Synapses
Predicting the Effects of Drugs on a Synapse Chemical or drugs can have a major impact on the functioning of the brain and nervous system Some prescription drugs can have a beneficial effect...
AQA A Level Biology复习笔记6.2.8 Transmission Across a Cholinergic Synapse
Transmission Across a Cholinergic Synapse There are over 40 different known neurotransmitters One of the key neurotransmitters used throughout the nervous system is acetylcholine (ACh) Synap...
AQA A Level Biology复习笔记6.2.7 Cholinergic Synapses
Cholinergic Synapses Where two neurones meet, they do not actually come into physical contact with each other – a very small gap, known as the synaptic cleft, separates them The ends of the ...
AQA A Level Biology复习笔记6.2.6 Maths Skill: Calculating Maximum Impulse Frequency
Calculating the Maximum Frequency of Impulse Conduction After an action potential passes through a section of an axon it undergoes a period of recovery and is unresponsive This is known as t...
AQA A Level Biology复习笔记6.2.5 Speed of Conduction of Impulses
Factors that Affect the Speed of Conduction The speed of conduction of an impulse refers to how quickly the impulse is transmitted along a neurone It is determined by multiple factors: The p...
AQA A Level Biology复习笔记6.2.4 The Refractory Period
The Refractory Period Very shortly (about 1 ms) after an action potential has been generated in a section of the axon membrane, all the sodium ion voltage-gated channel proteins in this sect...
AQA A Level Biology复习笔记6.2.3 Nerve Impulses
Action Potentials Neurones transmit electrical impulses, which travel extremely quickly along the neurone cell surface membrane from one end of the neurone to the other Unlike a normal elect...
AQA A Level Biology复习笔记6.2.2 Resting Potentials
Resting Potentials Neurones transmit electrical impulses, which travel extremely quickly along the neurone cell surface membrane from one end of the neurone to the other In a resting axon (o...
AQA A Level Biology复习笔记6.1.14 Calculating Cardiac Output
Calculating Cardiac Output Cardiac output (CO) is the term used to describe the volume of blood that is pumped by the heart (the left and right ventricle) per unit of time An average adult h...
